You can tailor TSO/VTAM user messages using the MVS™ Message Service (MMS). You define TSO/VTAM user messages to MMS the same way you define USS user messages. For details, see Defining USS messages to the MVS message service.

The TSO user selects the language used for TSO/VTAM messages using the PROFILE command with the PLANG operand. TSO/VTAM then retrieves its messages from MMS using the language specified by the user. This language continues to be used until the TSO/user changes the language (by reissuing the PROFILE command).

Before the TSO user can issue the PROFILE command, TCAS may issue messages IKT00201I through IKT00204I. The language used for these messages is specified on either the LANG operand of the MODEENT macroinstruction or on the USS logon command using the LANG or LANGTAB operands. The language is passed from these sources to the TSO/VTAM logon exit.

For information about how MMS translates messages, see Message translation using the MVS Message Service.